New
#50
PIN sign in error
Had the same thing happen to me as well a few days ago namely when the new Anti-Malware client version 4.12.17007.18022 was auto-installed. Only way to get pin working again was following this:
Open File Explorer and browse to this location:
C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\NGC
Take ownership of NGC and its subfolders
Delete NGC and everything within that folder
Go to Settings-> Accounts->Sign-in Options
Click Add a PIN again and set your PIN
PIN sign in should work going forward